Airworthiness 

Directive 

Luftfahrt-Bundesamt

Airworthiness Directive Section 

Hermann-Blenk-Str. 26 

38108 Braunschweig 

G E R M A N Y 

Enquiries regarding this Airworthiness Directive should be referred to Mr. Martin Borsum, Airworthiness Directive Section at the above address, 

fax-no. 0049 531/2355-725. Please note, that in case of any difficulty, reference should be made to the German issue! 

LTA ́s / AD ́s and Technical Notes are published on the internet at http://www.lba.de

Rolls-Royce Deutschland 

Affected:

Kind of aeronautical product: 

Manufacturer: 

Type: 

Models affected: 

Serial numbers affected: 

German Type Certificate No.: 

Aircraft Engine 

Rolls-Royce plc, Derby, United Kingdom 

DART 528, 529, 530, 540, 550 and 552 

DART 528-7E, 528D-7E, 

529-7E, 529-7H, 529-8E, 529-8H, 529-8X, 529-8Y, 529-8Z, 

529D-7E, 529D-7H, 529D-8E, 529D-8H, 529D-8X, 529D-8Y, 529D-8Z, 

532-7, 532-7L, 532-7N, 532-7P, 532-7R, 

533-2, 

534-2, 

535-2, 535-7, 535-7R, 

536-2, 536-2T, 536-7, 536-7P, 536-7R, 

542-10, 542-10J, 542-10K, 542-4, 542-4K, 

543-10, 543-10K, 

550-2, 

552-2, 552-7, and 552-7R 

All Dart Engines of the a.m.models, which have the Initial Issue or Revision 

1, but not Revision 2 or later Revisions of Service Bulletin Da72-533 incorporated and which have not been subject to a dimensional inspection of the 

Intermediate Pressure (IP) turbine disc in accordance with the Engine Overhaul Manual, Chapter 72-61-1 

7002, 7023, 7038, 7039, 7040 and 7041 

Subject:

Inspection and rework of the intermediate pressure (IP) turbine disc. 

Reason:

Since 1972 there have been a number of high pressure turbine disk diaphragm failures on in service engine, three 

resulted in the high pressure turbine disc being released. The failure have been attributed to excitations of the high 

pressure (HP) turbine assembly as a result of frettage between the high pressure turbine disc and intermediate 

pressure (IP) turbine disk seal arms. In extreme cases this can result in high cycle fatigue failure initiating in the 

seal arm radius. The actions specified by this Airworthiness Directive are intended to prevent high pressure (HP) 

turbine disc failure, which can result in an uncontained engine failure and damage to the airplane. 

Action:

This Airworthiness Directive requires the following actions: 

1. Dimensional inspection of the intermediate pressure (IP) turbine disc in accordance with Service Bulletin Da72-

538 or 

2. Ultrasonic inspection of HP/IP turbine disc seal arm in accordance with Service Bulletin Da72-536. If the ultrasonic inspections shows wear outside allowable limits the dimensional inspection of the intermediate pressure 

(IP) turbine disc in accordance with Service Bulletin Da72-538 must be carried out. 

3. Rework or exchange of the intermediate pressure (IP) turbine disc if wear outside allowable limits has been 

established. 

All necessary actions must be performed on the basis of the referenced manufacturer Service Bulletin. 

Compliance:

All compliance times of the mentioned actions have to be in compliance with the Rolls-Royce DART Service Bulletin Da72-538 dated June 10, 2005. 

D-2005-197

Effective Date: 30 June 2005
- 2 - 

Technical publication of the manufacturer:

Rolls-Royce DART Service Bulletin Da72-538 dated June 10, 2005 becomes herewith part of this AD and may be 

obtained from: 

Rolls-Royce Deutschland Ltd & Co KG 

Eschenweg 11 

15827 Dahlewitz 

G E R M A N Y 

Phone ++49-33-708-3-2026 or ++49-171-613-4213 

Fax ++49-33-708-6-3614 

EASA Approval:

Approved by EASA under approval number 2005-5848 on 10 June 2005.